Running Pace Calculator + Race Time Predictor by Distance
Convert time ↔ pace in both directions, then see what that same pace projects to at 5K, 10K, half, and full
Enter a distance and a time to get your pace per kilometer and your speed, or enter a target pace to get the finish time — it converts either direction. Then it takes that pace and projects what you'd run at 1K, 5K, 10K, half marathon, and full marathon in one table, which is how you find out where your current fitness actually sits across distances and what a realistic next goal looks like. 5K, 10K, half, and full presets are one tap away, and results copy as a single line.
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How to use
- Choose the 'Time to Pace' or 'Pace to Finish time' tab.
- Enter the distance (km) or press the 5K, 10K, half, or full button.
- Enter your goal finish time (h:m:s) or pace (min:sec/km).
- Review your pace, finish time, and speed plus the predicted-time table by distance, then copy the result.
FAQ
- What does pace mean?
- Pace is the time it takes to run 1 km (min:sec/km). For example, '5:00' means running 1 km in 5 minutes; the smaller the value, the faster.
- How long are the half and full marathon distances?
- A half marathon is 21.0975 km and a full course is 42.195 km. Pressing the preset button fills in the exact distance automatically.
- Can I trust the predicted-time table as-is?
- It's a simple calculation that applies your entered pace evenly across the whole distance, so treat it as a reference. In reality, hills, wind, and late-race slowdown cause differences, so use it only as a basis for goal-setting.